Toshiba CTX28 manual RSTU1, 2 and 3 Controls, Indicators, and Connectors

PCB Installation

BSTU/RSTU – Standard Telephone Interface Unit

3.After installing the BSTU, gently pull the BSTU outward. If the connectors are properly mated, a light resistance is felt.

Note When installing the RSTU3 into an existing system, system power must be cycled only if the MW mode (P11) is changed.

Table 6-5 BSTU Controls, Indicators, and Connectors

Control/Indicator/	Type of Component	Description
Connector
R48S connector P6	9-pin connector	Interface connector to P6 of R48S.
R48S connector P7	6-pin connector	Interface connector to P7 of R48S.
		Mu Law or A Law PCM companding. (Must be
Mu/A P10	3-terminal jumper	set to Mu Law in the U.S. and Canada). No
		strap = Mu Law.
Ring-time P12	3-terminal jumper	Always set jumper to “REN3.”
Table 6-6 RSTU1, 2 and 3 Controls, Indicators, and Connectors
Control/Indicator/	Type of Component	Description
Connector
R48S connector P6 (RSTU)	9-pin connector	Interface connector to P6 of R48S.
R48S connector P7 (RSTU)	6-pin connector	Interface connector to P7 of R48S.
		Mu Law or A Law PCM companding. (Must be
Mu/A P10 (RSTU3 only)	3-terminal jumper	set to Mu Law in the U.S. and Canada). No
		strap = Mu Law.
		CON = Electronically controlled message
		waiting light (U.S. and Canada).
MW (Message Waiting) Mode	3-terminal jumper	NOR = Relay controlled message waiting light.
P11 (RSTU3 only)		Do not use this in the U.S. and Canada since
		this option may cause message waiting cross-
		talk noise in some installations.

50-Pin Amphenol

Connector (Female)

BSTU1A P6

P7

P6

R48S

P7

RING-TIME

P12

Mu A

P10

SBSS Subunit

Backplane Connector

Optional

6592

Figure 6-7 BSTU Controls and Interface Connectors

6-12 Strata CTX I&M 06/04